Method of preparing star-type multi-arm silicon oil
A technology of silicone oil and star shape, which is applied in the field of preparation of star-shaped multi-arm silicone oil, can solve the problems of restricting the application of silicone oil, defects in mechanical properties, high degree of branching, etc., and achieve process control, low apparent viscosity, and controllable molecular weight Effect
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Embodiment 1
[0024] 1.136g (0.48%) of anhydrous tetramethylammonium octaoxide POSS and 236.8g (99.52%) of octamethylcyclotetrasiloxane were placed in a 500mL three-necked bottle, 80°C, mechanically stirred at 300rpm, and reacted under nitrogen protection for 24 After the reaction, the temperature was raised to 145°C for half an hour to obtain a hydroxyl-terminated star-shaped eight-arm methyl silicone oil with a molecular weight of about 200,000 and a room temperature viscosity of less than 10 PaS.
Embodiment 2
[0026] 1.136g (0.17%) of anhydrous tetramethylammonium octaoxide POSS was dissolved in 10mL of ethanol (or 10mL of xylene), and then mixed with 236.8g (35.18%) of octamethylcyclotetrasiloxane and 435.2g (64.65%) Mix tetramethyltetraphenylcyclotetrasiloxane, put it in a 1000mL three-neck bottle, remove ethanol under reduced pressure, and react at 85°C, magnetic stirring at 1000rpm, under argon protection for 36 hours, and heat up to 150°C after the reaction After cooling for one hour, the hydroxyl-terminated star-shaped eight-arm methyl phenyl silicone oil is obtained, with a molecular weight of about 600,000 and a room temperature viscosity of less than 20 PaS.
Embodiment 3
[0028] 1.136g (1.25%) anhydrous tetramethylammonium octaoxide POSS with 88.8g (97.33%) hexamethylcyclotrisiloxane and 1.296g (1.42%) hexamethyldisiloxane (MM), placed in 250mL In a three-necked bottle, react for 48 hours at 75°C, magnetically stirred at 500rpm, and protected by high-purity nitrogen. After the reaction, the temperature is raised to 140°C for half an hour. After cooling down, methyl-terminated star-shaped eight-arm methyl silicone oil is obtained, with a molecular weight of 10. About 10,000, the room temperature viscosity is less than 10PaS.
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